Update dependency firebase_auth to v6.6.1

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This PR contains the following updates:

Package	Type	Update	Change	Pending
firebase_auth (source)	dependencies	patch	6.6.0 → 6.6.1	6.7.0

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Release Notes

firebase/flutterfire (firebase_auth)

v6.6.1

Compare Source

• FIX(firebase_auth): compile Android Kotlin without checker-qual on inferred types (#​18610). (811b07db)

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